Multi Rig

[anaxcrosswords]

Anyone remember this toy from late 60s / early 70s?
It consisted of packs of stiff board (I'm guessing roughly A3 size) which were red, yellow or blue on one side and white - with some simple design like a wheel or cooker hob - on the reverse. You used white plastic clips to join them together to make houses, cars, mazes or whatever.
I think my brother and I had a fairly basic pack but you could get extended ones with more pieces including triangular boards.